/*
   Copyright (c) 2011, 2012 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-18 Marco Riccardi - initial implementation
 *  2012-04-06 Marco Riccardi - added message in DliParseException
 *
 */
package org.mizartools.dli;

public class Ex extends Formula {

	private Variable variable = null;
    private Type type = null;
    private Formula formula = null;

	private Ex(){
		super();
	}

	public Ex(Variable variable, Type type, Formula formula) throws DliException {
		if (variable == null || type == null || formula == null){
			throw new DliException();
		}
		this.variable = variable;
		this.type = type;
		this.formula = formula;
    }
	
	public static Ex newInstance(String string) throws DliParseException {
		Ex ex = new Ex();
		int position = Utility.searchSeparationComma(string);
		if (position == -1) {
			throw new DliParseException("["+string+"] is not valid in Ex");
		}
		ex.variable = Variable.newInstance(string.substring(0, position));
		string = string.substring(position+1);
		position = Utility.searchSeparationComma(string);
		if (position == -1) {
			throw new DliParseException("["+string+"] is not valid in Ex");
		}
		ex.type = Type.newInstance(string.substring(0, position));
		ex.formula = Formula.newInstance(string.substring(position+1,string.length()));
		return ex;
	}

	@Override
	public String toString() {
		return "$ex("+variable.toString()+","+type.toString()+","+formula.toString()+")";
	}

	public Variable getVariable() {
		return variable;
	}

	public Type getType() {
		return type;
	}

	public Formula getFormula() {
		return formula;
	}
	
}
